compare

http://www.english.upenn.edu/~jlynch/Computing/compare.html
Originally designed as an experiment in fuzzy logic, 'compare' has turned into a tool for identifying literary allusions. A machine can analyze large quantities of text with perfect recall. This is particularly advantageous when working with lesser known texts with which readers have a limited degree of familiarity. Other possible applications include indentifying the author of an unattributed piece, or reavealing a point at which an author first read a work. "Allusion" is interpreted as current text that shares something with the source text: words, orthography, meanings, syntactical relations, etc. Using 'compare,' the computer can detect a measure of similarity between two pieces of text, which defines them as potentially allusive.

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